Emulated sky is an artificial sky. The sky of GTA4 is hacked. It synchronized with real time clock include sunset/sunrise time and actual weather from Berlin. To achieve synchronization with real world, a custom dll written in C++ and a program that pulls actual weather data from Yahoo weather written in Java(Processing) was made and used. The hacked sky was shown parallel with real sky. It shows contrast between reality in game and reality in the real world.